<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h2>{{message}}</h2>

    <!-- 在进行中间插入时会极大提高效率-->
    <!-- https://cn.vuejs.org/v2/api/#v-for-->
    <ul>
        <li v-for="item in letters" v-bind:key="item">{{item}}</li>
    </ul>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data: {
            message: 'simplelu',
            letters: ['A', 'B', 'C', 'D', 'E']
        }
    })
</script>
</body>
</html>